HPUX IA 11.31 running Oracle 11.1.0.7 & 10.2.0.4

We have Oracle 11.1.0.7 and 10.2.0.4 installed on an HP Itanium running HPUX 11.31. Oracle installs fine and all the recommended patches/patchsets/kernel parameters have been applied. However, in both Oracle environments extension of datafiles fails. If all datafiles are created such that every object can fit in the datafile with no extending, no errors occur. When using dbca (database creation assistant) the database creation fails when creating objects in SYSTEM or SYSAUX tablespaces. Both oracle environments generate the same errors “unable to extend X by X in tablespace X.”The datafiles are autoextend with maxsize either very large or unlimited. There is plenty of disk space on the volume where the datafiles reside. At first look I thought this was an Oracle issues but with both Oracle 11&10g running getting the same errors I am inclined to think that this is something underneath Oracle that is failing.